量子电子学报 ›› 2024, Vol. 41 ›› Issue (6): 933-941.doi: 10.3969/j.issn.1007-5461.2024.06.010

• 量子光学 • 上一篇    下一篇

时频域结合的量子通信时间同步方法

沈 威 , 刘尉悦*   

  1. 宁波大学信息科学与工程学院, 浙江 宁波 315211
  • 收稿日期:2022-12-05 修回日期:2023-01-13 出版日期:2024-11-28 发布日期:2024-11-28
  • 通讯作者: E-mail: liuweiyue@nbu.edu.cn E-mail:E-mail: liuweiyue@nbu.edu.cn
  • 作者简介:沈 威 ( 1998 - ), 浙江宁波人, 硕士, 主要从事量子通信与应用方面的研究。 E-mail: 15658225663@163.com
  • 基金资助:
    浙江省自然科学基金 (LY21F050003)

Time synchronization method for quantum communication based on time⁃frequency domain

SHEN Wei, LIU Weiyue *   

  1. College of Information Science and Engineering, Ningbo University, Ningbo 315211, China
  • Received:2022-12-05 Revised:2023-01-13 Published:2024-11-28 Online:2024-11-28

摘要: 时间同步对于星地量子密钥分发至关重要。以往的方案中为了在噪声干扰较大、信号丢失严重的星地链路 中完成量子光同步, 需要全球定位系统 (GPS) 信号辅助同步光来完成。为了降低系统的复杂性和成本, 本文提出了 一种时域与频域相结合的时间同步方法。该方法利用量子光序列的频谱特性以及线性拟合方法, 实现了高精度的时 间同步。对于星地量子密钥分发的实验数据进行测试, 可以实现1.03 ns的同步精度, 直方图半高宽为1.4 ns。该方法 不需要使用GPS以及同步光, 可以广泛地应用于星地量子密钥分发。

关键词: 量子光学, 时钟自恢复, 线性拟合, 量子密钥分发, 时间同步

Abstract: Time synchronization is crucial for satellite-to-ground quantum key distribution (QKD). To overcome the noise interference and the loss of quantum light signal in satellite-to-ground QKD, previous schemes used global positioning system (GPS) equipment to assist synchronous light mapping. In order to reduce the complexity and cost of the system, a time synchronization method combining time domain and frequency domain is proposed in this paper. The method utilizes the spectral characteristics of quantum light and linear fitting method to achieve high precision time synchronization. The method is tested with the experimental data of satellite-to-ground QKD, a synchronization accuracy of 1.03 ns can be achieved, and a full width at half maximum of the histogram is 1.4 ns. The method does not require the use of GPS and synchronous light, and can be widely used in satellite-to-ground QKD.

Key words: quantum optics, clock self-recovery, linear fitting, quantum key distribution, time synchronization

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